Type of coolant for a 99 mustang

Does anyone know the type of coolant to use to recharge the ac system for a 99 mustang. My friend brought some stuff from autozone that worked really good with his car and would like to buy something similar if I can. Thanks

Thanks. I am not sure if I will buy the stuff from autozone now or wait till I get back from vacation. Of course I drive from nyc to orlando florida and my ac doesnt work. Of course I did not know since its winter and cold in ny. If I did put the r134 in, and use just like one can it won't damage the system if there is another problem, like a leak somewhere or a bad compressor? I think the compressor is fine because when I am parked and turn the ac on, I can feel the compressor come on.

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